Product Description specificalPrinciple of the Assay: The microtiter plate provided in this kit has been pre-coated withan antibody specific to AQP-4. Standards or samples are thenadded to the appropriate microtiter plate wells with abiotin-conjugated antibody preparation specific for AQP-4 andAvidin conjugated to Horseradish Peroxidase (HRP) is added toeach microplate well and incubated. Then a TMB (3,3',5,5'tetramethyl-benzidine) substrate solution is added to each well.Only those wells that contain AQP-4, biotin-conjugated antibodyand enzyme-conjugated Avidin will exhibit a change in color. Theenzyme-substrate reaction is terminated by the addition of asulphuric acid solution and the color change is measuredspectrophotometrically at a wavelength of 450 nm +/- 2 nm. Theconcentration of AQP-4 in the samples is then determined bycomparing the O.D. of the samples to the standard curve.